Evaluation of strand bond properties along the transfer length of prestressed lightweight concrete members

2013 ◽  
Vol 49 ◽  
pp. 1048-1058 ◽  
Author(s):  
Cristina Vázquez-Herrero ◽  
Isabel Martínez-Lage ◽  
Gerardo Aguilar ◽  
Fernando Martínez-Abella
Keyword(s):  
Lightweight Concrete ◽  
Bond Properties ◽  
Transfer Length ◽  
Concrete Members ◽  
Strand Bond

Bond properties of lightweight concrete – A review

2016 ◽  
Vol 112 ◽  
pp. 478-496 ◽  
Author(s):  
Kim Hung Mo ◽  
U. Johnson Alengaram ◽  
Mohd Zamin Jumaat
Keyword(s):  
Lightweight Concrete ◽  
Bond Properties

Analysis and Prediction of Transfer Length in Pretensioned, Prestressed Concrete Members

2014 ◽  
Vol 111 (3) ◽  
Author(s):  
Byung Hwan Oh ◽  
Si N. Lim ◽  
Myung K. Lee ◽  
Sung W. Yoo
Keyword(s):  
Prestressed Concrete ◽  
Transfer Length ◽  
Concrete Members

scholarly journals Rehabilitation of Hybrid RC-I Beams with Openings Using CFRP Sheets

2022 ◽  
Vol 8 (1) ◽  
pp. 155-166
Author(s):  
Ali I. Salahaldin ◽  
Muyasser M. Jomaa’h ◽  
Nazar A. Oukaili ◽  
Diyaree J. Ghaidan
Keyword(s):  
Lightweight Concrete ◽  
Normal Weight ◽  
Reinforced Concrete Beams ◽  
Bottom Flange ◽  
Normal Concrete ◽  
Normal Weight Concrete ◽  
Concrete Members ◽  
Hybrid Beams ◽  
The Difference ◽  
Total Capacity

This research presents an experimental investigation of the rehabilitation efficiency of the damaged hybrid reinforced concrete beams with openings in the shear region. The study investigates the difference in retrofitting ability of hybrid beams compared to traditional beams and the effect of two openings compared with one opening equalized to two holes in the area. Five RC beams classified into two groups, A and B, were primarily tested to full-failure under two-point loads. The first group (A) contained beams with normal weight concrete. The second group (hybrid) included beams with lightweight concrete for web and bottom flange, whereas the top flange was made from normal concrete. Two types of openings were considered in this study, rectangular, with dimensions of 100×200 mm, and two square openings with a side dimension of 100 mm. A full wrapping configuration system for the shear region (failure zone) was adopted in this research. Based on the test results, the repaired beams managed to recover their load carrying capacity, stiffness, and structural performance in different degrees. The normal concrete beam regains its total capacity for all types of openings, while the hybrid beams gain 84% of their strength. The strength of hybrid concrete members compared with normal concrete is 81 and 88% for beams of one opening and two openings, respectively. Doi: 10.28991/CEJ-2022-08-01-012 Full Text: PDF

Bond Properties in Lightweight Self-Compacting Concrete

2016 ◽  
Vol 711 ◽  
pp. 211-217
Author(s):  
Giovanni Muciaccia ◽  
Gianpaolo Rosati
Keyword(s):  
Lightweight Concrete ◽  
Concrete Slab ◽  
Residential Buildings ◽  
Diameter Ratio ◽  
Slab Thickness ◽  
Bond Properties ◽  
Skilled Workers ◽  
Self Compacting Concrete ◽  
Proper Understanding ◽  
Bond Mechanism

The original development and use of Self-Compacting Concrete (SCC) in Japan started from the problem of the durability of concrete. Indeed, the reduction in the number of skilled workers, and the consequent poor compaction of structures, was a topic of great concern in the eighties, and helped the introduction of SCC. More recently, SCC is being commonly used in solid concrete slab in residential buildings for its excellent flowability. Additionally, to reduce structural self-weight without excessively affecting the slab thickness (which could represent a major issue in this applications), lightweight concrete represents a preferable solution. In this type of structure the development of anchorage or lap length becomes crucial, thus requiring a proper understanding of the bond mechanism. The result of an experimental campaign to assess bond properties for Lightweight Self-Compacting Concrete (LWSCC) are presented in this paper. The main investigated parameter is the bar size (ranging from 8 to 24mm) while the cover to diameter ratio and the bonded length to diameter ratio were kept constant. The experimental results are finally compared with code predictions.

Interface Structure of EPS and Pores Effect on Properties of EPS Lightweight Concrete

2013 ◽  
Vol 859 ◽  
pp. 109-113
Author(s):  
Xue Song Zhang
Keyword(s):  
Mechanical Properties ◽  
Polyvinyl Acetate ◽  
Lightweight Concrete ◽  
Three Dimensional ◽  
Interface Structure ◽  
Hydration Products ◽  
Bond Properties ◽  
Interfacial Bond ◽  
Interfacial Bond Strength ◽  
Interface Bond

The weak interfacial bond strength EPS beads and large intercommunicating pores in the EPS lightweight concrete result in degradation of the mechanical properties of the concrete. The interface bond properties between EPS beads and the concrete can be improved by using the polyvinyl acetate (PVA) emulsion and silica fume. To prevent EPS beads rise up to the surface in the concrete mixing and reduce the number of larger pores in the concrete, vibrating with pressure, which can enhance the mechanical properties of the concrete, is applied. To decrease the aperture size of large pores and enhance thermal performance of the concrete, it is appropriate to decrease EPS beads size . The three-dimensional net structure formed by the polyvinyl acetate (PVA) emulsion and the hydration products of cement in the large pores of the concrete can reduce connectivity of the pores in the concrete ,thus the anti-frozen properties of the concrete is up as well.

Development of a laser-speckle imaging device to determine the transfer length in pretensioned concrete members

PCI Journal ◽  
2012 ◽  
Vol 57 (1) ◽  
pp. 135-143 ◽  
Author(s):  
Weixin Zhao ◽  
Kyle Larson ◽  
Robert J. Peterman ◽  
B. Terry Beck ◽  
Chih-Hang J. Wu
Keyword(s):  
Laser Speckle ◽  
Laser Speckle Imaging ◽  
Speckle Imaging ◽  
Transfer Length ◽  
Imaging Device ◽  
Concrete Members ◽  
Pretensioned Concrete
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